Bung bush



Oct. l, 1940. D. HoLzKMPE-R BUNG BUSH Filed Aug. 11, 1937 Patented Oct.1, 1940 UNITED STATES PATENT OFFICE BUNG BUSH Application August 11,1937, Serial No. 158,577

In Germany May 4, 1936 s claims.

The invention relates particularly to bung bushes of the kind which, onbeing xed to the wall of sheet-metal containers and the like, aresubjected toa subsequent deformation.

Hitherto such bung bushes have had to be made from a relativelyexpensive, high-quality material which will stand deformation when inthe cold state, for instance from malleable steel.

'Not only is the material very costly, but the cost of manufacture isconsiderably greater than is the case with bushes which can be made of.

material that can be cast.'

On the other hand bung bushes made' for instance by die-casting or thelike have a great advantage which is due to the lowermanufacturingcosts. The die-cast bushes are produced in the press die in thecompletely finished form including the thread and require no" subsequentoperations. As however die-casting cannot be employed for bung busheswhich havev to be subsequently deformed when being xed, as it isunsuitable for being deformed in the cold state, such bungs could onlybe used in cases in which the bush has not to be deformed in any Waywhen being xed to the metal wall of the containers. l

The invention overcomes the existing disadvantages by providing a bungbush composed partly of material which can be deformed when 30, cold andpartly of material which cannot be deformed. For instance, only the partof the bush to be deformed is made of soft metal, whilst the remainingpart` of the bung bush consists of die-cast material. 'I'his has theadvantage that the bung bush can be made mainly of die-cast or otherwisecast material without there being any waste of material and without thenecessity of subsequent tooling. As the deformable part a simple metalring cast in the bush is mostly used,

which is preferably provided with perforations, for the purpose ofgiving the molten material the possibility of adhering more firmly tothe applied part and of increasing the stability of the bush. 'I'hroughthe avoidance of all waste .and

through the simplified mode of manufacture of the bung bush themanufacturing costs are greatly reduced as compared with the stamped andpressed bung bushes. In view of the considerable mass production of bungbushes the saving described is particularly important.

In the accompanying drawing Fig. 1 represents in cross-section a bungbush inserted in the bush bearing of a container wall, the bush beingshown on the left-hand side before being xed to the container wall andon the righthand side after being fixed.

Fig. 2 is a sectional view of a modification of the invention.

Fig. 3 is a side elevation of the form of bush ll illustrated-in Fig. 2.

Fig. 4 is apartial section of a further modified f orm of the invention.

Fig. 5 is a fragmentary elevation of the form of invention shown in Fig.4.

Referring to the drawing in detail, the bung bush consists of thedeformable ring a which is cast in the bush body b made for instance ofdie-cast material. The ring a. may be made in a simple way for instanceof band iron. It is 15 inserted in the die-casting mould and theremaining space in the die is filled with die-casting material. 'I'hethreaded part c is also formed in the die-casting mould, so that thebush is directly ready for use after being removed from 20 the die. Forobtaining better cohesion between the ring a. and the die-cast body bthe former may with advantage have a portion d of the inserted partexpanded. The iiange b of the bush body b is -made polygonal in a knownmanner 25 for preventing the bung bush from turning, in the seat formedin the wall k of the container after the edge of the ring a is turnedover the container flange l. During the application of the bung bush tothe container, the packing m 30 is pressed tightly between the body band the container wall.

In the modification of the invention shown in Figs. 2 and 3, the ring ais provided with perforations e, which are lled by the die-cast material35 and ensure a further better cohesion of the two different materials.The arrangement of the perforations e is more clearly seen from Fig. 3.

In the form of invention shown in Figs 4 and 5 o trapezium-shaped piecesf are cut out of the ring a, which are lled by the die-cast material.

In this way continuity of the die-cast material on either side of thering a is obtained.

What I claim is: 45

1. A two-part bung bushing adapted. to be fixed in an opening of acontainer wall comprising, a ring member of relatively thin deformablematerial, and a body member of substantially non-deformable materialunited to an end por- 50 tion of the ring member by casting to form aunitary bung bushing, the free end of said ring member being adapted tobe deformed into engagement with the surface of the container wall.

2. A two-part bung bushing adapted to be 5 3. An outlet adapted to befixed in an opening of a container wall comprising, a ring member ofrelatively thin deformable material, and a body member of substantiallynondetormable material united to anend portion of the ring member bycasting to form a unitary structure.

Ythe free end'of said ring 4member being adapted to be deformed intoengagement with the surface of the container wall.

DAVID HoLzKmER.

